Fatalis is the end-game Large Monster for Monster Hunter. He could only be fought online in the original Monster Hunter. The setting is at night in Castle Schrade. He is one of the three Elder Dragons in the original Monster Hunter, the others being Lao Shan-Lung and Kirin. The first of the Fatalis brethren.

Crimson Fatalis, also known as Red Fatalis, is a Black Fatalis whose shells and scales have become their reddish-crimson color after generations of exposure to the Volcano. Crimson Fatalis is the second of the Fatalis brethren and it lurks in the depths of the Volcanic Belt, where it lives as one with the environment.